Calipers



J. STUA RT CALIPERS July 12/, 1927.

Filed Sept. 17. 1924 3 Sheets-Sheetl July 12, 1927.

J. STUART CALIPERS I 3 Sheets-Sheet 2 Filed Sept. 17. 1924 J. STUART July 12, 1927.

CALIPERS 3 Sheets-Sheet 3 Filed Sept. 17, 1924 Patented July 12, 1927.

UNITED STATES P TE OFFICE.

:osnrrr STUART, or WILMINGTON, DELAW RE, AssroNon 'ro oIanEL oAR WHEEL coMrA Y, or WILMINGTON, DELAWARE, 'AconronArroN or DELAWARE.

cALIr ns.

, Application filed September 17,1924. Serial no; 73:,171. i

' I This invention relates to calipers, and

more particularly to calipers adapted for use in gaging rolls and the like.

One of the objects of the invention is to.

provide a caliper of this type so constructed as to be adjustable for rolls of different diameters, and to increase the range of usefulness beyond those of other devices commonly employed-for the same purpose. I Y he invention also resides in the novel details of construction which provides for the simultaneous equal adjustment of both arms of the caliper. V The inventionfurther resides in a novel arrangement of parts which insures a true contact between the caliper and the sides of the roll which it is desired to gage. In'the attacheddrawings:

Figure lis a frontelevation of the caliper illustrating the manner in which it is used to ga e a r01 I t Y s ig. 2 is a side elevation ofthe caliper; Fig. 3 is an enlarged fragmentary section on the line 3-3, Fig. 2;

Fig. is an enlargedsection on the line 4-4, Fig. 3;, g

F 5 is an enlarged. section on the line 55,Fig.3;

Fig. v6 is an enlarged section on the line 6-6, Fig. '3, and Fig. 7 is a fragmentary view illustrating a modification of the micrometer.

With reference to the drawings, and particularly to Figs. 1 to 6, inclusive, the caliper comprises a substantially triangular body 7 portion l havin laterally oflt'set guide channels 2, 2, for ca iper arms 3 and 4. .In the present instance, the body 1 consists of two plates 5 and 6 secured together by screws 7, 7, and so recessed on the inside as to'form the aforesaid channels 2, 2, for the arms 3 and 4. Each of these arms, as shown in Fig. 4, comrises a longitudinal laterally projecting auge 8, and whereas the .arm .3 is provided at its lower edge qwith a rack .9, the arm 4 has a similar racklO formed along its upper ed j y The plates 5 and 6 are provided withoppos'itely arranged bosses, 11 and 12, res tively, in which is j ournaled a shaft 13w ich being carries a pinion 14 and which carries alsoon that end which projects beyond the boss 11 a knurled head 15 by means of which the shaft 13 -may be manually rotated. The shaft 13 is by means of a set screw 16, see Fig. 5, which 1s threaded into the boss 11 and projects into an annular recess 17' in the said shaft, this prov ding for rotation of the shaft but preventing movement body. .As shown in Fig. 3, the pinion 14 1s so located that it coacts with the racks 9 and 10, and it will be obvious that rotation of the shaft 13 will cause the arms 3 and 4 move longitudinall 1n the channels 2, 2, in the same relative directlon and to the same extent. For the purpose of securingthe arms in any one of. their adjusted positions, set screws 18 and 19 are provided in the'body be forced down against the upper edges of the said arms 3 and 4.

Each of the plates 5 and 6 is also provided at its lower end with a boss 20 and 21 respectively, which are constltute together a journal for. a shaft 22, whichshaft projects beyond the jour nals at each end; and from these projecting ends is suspended a saddle 23 adapted to seat against body which it may bejdes-ired to gage, as shown 1n Flgs. 1. and 3,1 and thereby to con-. stitute a support for the body 1 and for the arms 3 and 4.

instance a cross bar 24;, againstthe upper face of which is adapted to bear a plunger 25 .slidable in a recess 26 in the plate 6, as shown-in 1 Fig. 4, and normally retained in the bottom of spring 27. As shown in Fig. 4, the lunger 25 has alt-its upper end a flange 28 w ich retains the which constitutes its bearing, the sleeve 29 cess 26, as clearly shown, and providing for theremoval of 1 plunger for replacement, if such should be necessary, and for release also of the wring 27.v V

The outer end of each of the arms 3 and 100 held in place in the said journals 56 thereof axially inthe y and simultaneously 6 1 which may oppositely arranged "and the surface of arch or 'like'eo I The saddle 23 comprises in the present saidzreoess by means of a plunger in a threaded sleeve 29 threaded into the lower endof the r'e- 9t i is providedwith an extension 30 and 31 respectively, these extensions carrying at their lower ends contact elements 32 and 33 which in operation are adapted to engage the surface oi the roll, as illustrated in Fig. 1. Each ol these contact elements is clamped in place in the parts 30 and 31 by means in present instance of clamping screws 3% and 35, and in the present instance, also, the element 33 is inthe form of a screw whereby this may be adjusted as desired.

In using this device, thearms 8 and 4 are set astraddle of the. roll. or other object which is to be gaged, as clearly illustrated, and it will be noted that the saddle on the bottom is provided withtwo parallel contacting edges 36, 36, which extend at right angles to the planes of the arms 3 and l, and which naturally assume, when brought into contact with the roll, positions parallel to the longitudinal axis ol' the latter. filter the saddle 23 engages the side of the roll, the arms 3 and i are adjusted by means oi"? the shaft 13, and as previously described, until the contact elements 32 and 33 are in alignment with the true diameter of therroll, final adjustmentotl the contact points into engagement with the surface of the roll be-- .ing accomplished by adjustment of the screw This adjustment o'if the instrument is maintained by tightening the various set screws l8, l9 and 35, and the instrument may then be moved axially along the roll to there by determine whether the roll is of uniform size or uniform diameter throughout. Also by moving the instrument around. the roll, it is possible to-detern1ine whether or not the roll is a true cylinder.

Where a true reading oi the diameter or size is required, one or both'ol? the arms may be scaled, as shown in Fig. 1,- and one or other of the contact elements, such as 32, may take the form of a micrometer for the final fine adjustment and reading; In lieu of the micrometer oi the usual form, an indicating device such as shown in Fig. 7 may be en'iployed, which allords the desired read ing without necessity for manual adjustment.

The function of the plunger 25 will be ap parent'to those acquainted with the art, this plunger by reason of the spring 27 acting to give the body 1 and the arms 3' and t a bias which maintains one of the contact elements, in the present instance the element 33, in firm contact with the surface oi the roll. The spring-pressed plunger 25 materially la cilitates the adjustment of the device to the roll and insures accuracy inv operation,"

A material advantageol the device described resides inits adaptability to rolls of a wide range of size. This will be clearly illustrated in Fig. 1, in which the maximum and minimum sizes are illustrated in broken lines. The device further is of simple form and easy to manufacture and to manipulate, both in the actual gaging operation and in the adjustments to any particular roll or other body.

The device is subject to modification Without departure from the essential feature 01 the invention.

I claim:

1. Calipers comprising a body, arms adjustable in the body and relatively movable to vary the distance between the corresponding extremities, a support member pivotally secured to the body and adapted to assume an operative position between said arms, and resilient means tending to move said memher on its pivot toward one of the arms.

' -52. Calipers comprising a supporting member adapted to rest against a body to be measured, a pair of relatively movable elements, and means for pivotally securing said elements to said member whereby when the member rests against said body the said elements are maintained in predetermined relative positions with respect to the body and at opposite sides of the supporting member.

3. Calipers comprising a member adapted to engage a body to be measured, a pair of relatively movable elements, means for pivetally securing said elements to said member, said elements being adapted to contact with said body at points on opposite sides thereof when said member engages the body,and a spring interposed between the member and said elements and tending to move said member around the pivot towards one of said elements.

4L. Calipers comprising a body, a work-engaging member pivotally secured to said body, measuring elements adjustable in the body and projecting on opposite sides of said member, means for rigidly securing said arms in the body, and a spring engaging both the body and the said member and tendingto shift said member towards one of said measuring elments.

5. Calipers comprising a body, work embracing arms adjustable in said body, a malt-engaging member pivotally secured to the body intermediate the arms, and a spring carried by the body at one side of the pivot and adapted to exert a pressureon the work engaging member tending to move the latter on its pivot towards one of said arms.

6. Calipers comprising abody, worl embracing arms adjustable in said body, a work-engaging member pivotally secured to said body intermediate the arms, and means for relatively moving said arms to vary the distance betwen said work-embracing parts.

7. Calipers comprising a body member, work-embracing arms adjustable in said body to vary thedistance between the workembracing parts, and a work-engaging membracing arms adjustable in said body to vary ber pivotally secured to said body interme- "the distance between the work-embracing diate the arms and adapted when engaging parts and a work-engaging member pivotalthe work to maintain the said arms in prely secured to the body between said arms and 5 determined relative positions with respect to comprising spaced parallel edges extending the work, at right angles to the plane of said arms.

8. Calipers comprising a body, work-em- JOSEPH STUART. 

